けれどもBut, Although

けど and だけど are more casual and frequently used in daily conversations or informal writing. On the other hand, けれども carries a more formal or polite tone, and it's more commonly used in written language, formal speeches, or business conversations. The three are all used to connect two clauses and create a contrast or contradiction, like the English conjunction "but".

The particle が in Japanese is used to denote a subject, introduce a new topic, or express contrasts, often equivalent to the English "but". It highlights the information presented before it. On the other hand, けれども is a conjunction that connects two conflicting ideas or sentences, similar to the English “however” or “although”. It is used to express a contrasting outcome or situation from what was originally expected.

Both だが・ですが and けれども are used for expressing "but" or "however" in Japanese. The difference comes into play in terms of formality. だが・ですが is generally used in less formal situations or casual conversation, while けれども is more formal and is often encountered in situations like formal speeches, official writings, and news reporting. Therefore, the choice depends largely on the context and tone you want to convey.

Both "ものの" and "けれども" are used to indicate contrast or contradiction in Japanese. The nuance difference lies in the level of formality and certainty. "ものの" indicates a stronger contrast and of a more formal tone than "けれども," usually used in written language or formal speech. Additionally, "ものの" implies that the situation or fact mentioned in the latter part is unexpected or undesirable, while "けれども" just neutrally presents the contradiction.

"ところが" and "けれども" are both linking phrases used to contrast information or express surprise in Japanese. However, "ところが" is used to describe unpredicted or surprising situations that are opposite to what was expected, while "けれども" is used in a more straightforward manner to contrast with the previous statement or to express a concession. Though both can be roughly translated to "however" or "but" in English, "けれども" is more formal and can be used to start a sentence, whereas "ところが" typically cannot.